The people allegedly involved were not identified, but sources told Radar the Friends star, 50, and Theroux, 48, were known to have blowups — and that they had erupted in a face-to-face showdown at the mansion on December 14, 2017.

Although a rep for the actress denied the December incident took place, “Justin removed himself from the situation before it got physical” and checked into a hotel, an insider said at the time.